Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v3.21.2
Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Stockholders' Equity  
Summary of restricted stock award activity

Weighted Average

Number of

Grant Date Fair

    

Shares

    

Value  

Non-vested at December 31, 2020

3,869,896

$

3.61

Granted

919,012

2.70

Vested

(511,707)

3.81

Non-vested at June 30, 2021

4,277,201

$

3.39

Summary of stock option award activity

The following table summarizes stock option award activity for the six months ended June 30, 2021:

Weighted Average 

Remaining

Weighted Average 

 Contractual Life

    

Stock Options 

    

Exercise Price

    

(in years)

Outstanding as of December 31, 2020

220,000

$

3.20

8.04

Granted

50,000

2.85

Outstanding as of June 30, 2021

270,000

$

3.14

7.94

Vested and exercisable as of June 30, 2021

50,000

$

2.56

7.94

Summary of stock options granted

For the Six Months Ended June 30,

 

    

2021

    

2020

 

Risk-free interest rate

 

1.04% - 1.50

%

1.02

%

Expected dividend yield

 

Expected term in years

 

10.0

10.0

Expected volatility

 

100.65% - 102.71

%

101.27

%

Summary of warrant activities

A summary of warrant activities for the six months ended June 30, 2021 is presented below:

Weighted Average 

Remaining

Weighted Average 

Contractual Life

    

Warrants 

    

Exercise Price 

    

(in years)

Outstanding as of December 31, 2020

57,515

$

5.39

1.22

Expired

(44,324)

7.00

Outstanding as of June 30, 2021

13,191

$

0.00

4.33

Summary of stock-based compensation expense

The following table summarizes stock-based compensation expense for the three and six months ended June 30, 2021 and 2020 ($ in thousands):

For the three months ended June 30, 

For the six months ended June 30, 

    

2021

    

2020

    

2021

    

2020

Research and development

$

158

$

161

$

319

$

305

General and administrative

 

608

 

570

 

1,221

 

1,065

Total stock-based compensation expense

$

766

$

731

$

1,540

$

1,370